George Zimmerman on Univision: I'm homeless, suffering from PTSD

George Zimmerman, the Neighborhood Watch volunteer who fatally shot Trayvon Martin, told Spanish-language television network Univision that he is homeless and suffering from post-traumatic stress disorder.

An English translation of the interview that will air Sunday was released to the media Saturday .

Zimmerman will speak on a special edition of "Aquí y Ahora" at 7 p.m.

Special correspondent Ilia Calderón spoke at length to Zimmerman, who shot the 17-year-old Miami Gardens youth in February 2012 in Zimmerman's gated community in Sanford.

In the interview, Zimmerman repeatedly declines to answer questions about the shooting, citing a still-pending federal civil-rights investigation.

However, he tells Calderón that his first reaction after firing the shot was concern that he had missed.

"I was afraid it had gone through his clothes and that it was going to go ... get lost, and, um, you know, go into a house and — because the young man was still talking to me, as I have said. So I thought that it hadn't … affected him, and I got worried, and I said, 'I hope that it hasn't — that the bullet hasn't hit a neighbor,'" Zimmerman says. "But I only knew that the attack stopped."

Zimmerman describes receiving death threats, which he attributes to the portrayal of the shooting in the media.

"You don't think it's because of the fact that you fired [a] gun?" Calderón asks.

Zimmerman was charged with second-degree murder in Trayvon's death by a special prosecutor but was acquitted at trial last year. The case sparked international outrage and protests and renewed debate about Florida's "stand your ground" self-defense law, racial profiling and gun rights.

A Justice Department investigation will allege sweeping patterns of discrimination within the Ferguson, Mo., Police Department and at the municipal jail and court, a law enforcement official familiar with the report said Tuesday.